/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.api.utils;

import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.LOG_LINES;

import org.apache.dolphinscheduler.plugin.task.api.TaskException;

import java.util.List;
import java.util.Optional;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.fabric8.kubernetes.api.model.Pod;
import io.fabric8.kubernetes.api.model.batch.v1.Job;
import io.fabric8.kubernetes.api.model.batch.v1.JobList;
import io.fabric8.kubernetes.client.Config;
import io.fabric8.kubernetes.client.DefaultKubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.Watch;
import io.fabric8.kubernetes.client.Watcher;

public class K8sUtils {

  private static final Logger log = LoggerFactory.getLogger(K8sUtils.class);
  private KubernetesClient client;

  public void createJob(String namespace, Job job) {
    try {
      client.batch()
          .v1()
          .jobs()
          .inNamespace(namespace)
          .create(job);
    } catch (Exception e) {
      throw new TaskException("fail to create job", e);
    }
  }

  public void deleteJob(String jobName, String namespace) {
    try {
      client.batch()
          .v1()
          .jobs()
          .inNamespace(namespace)
          .withName(jobName)
          .delete();
    } catch (Exception e) {
      throw new TaskException("fail to delete job", e);
    }
  }

  public Boolean jobExist(String jobName, String namespace) {
    Optional<Job> result;
    try {
      JobList jobList = client.batch().jobs().inNamespace(namespace).list();
      List<Job> jobs = jobList.getItems();
      result = jobs.stream()
          .filter(job -> job.getMetadata().getName().equals(jobName))
          .findFirst();
      return result.isPresent();
    } catch (Exception e) {
      throw new TaskException("fail to check job: ", e);
    }
  }

  public Watch createBatchJobWatcher(String jobName, Watcher<Job> watcher) {
    try {
      return client.batch()
          .v1()
          .jobs()
          .withName(jobName)
          .watch(watcher);
    } catch (Exception e) {
      throw new TaskException("fail to register batch job watcher", e);
    }
  }

  public String getPodLog(String jobName, String namespace) {
    try {
      List<Pod> podList = client.pods().inNamespace(namespace).list().getItems();
      String podName = null;
      for (Pod pod : podList) {
        podName = pod.getMetadata().getName();
        if (jobName.equals(podName.substring(0, pod.getMetadata().getName().lastIndexOf("-")))) {
          break;
        }
      }
      return client.pods().inNamespace(namespace)
          .withName(podName)
          .tailingLines(LOG_LINES)
          .getLog(Boolean.TRUE);
    } catch (Exception e) {
      log.error("fail to getPodLog", e);
      log.error("response bodies : {}", e.getMessage());
    }
    return null;
  }

  public void buildClient(String configYaml) {
    try {
      Config config = Config.fromKubeconfig(configYaml);
      client = new DefaultKubernetesClient(config);
    } catch (Exception e) {
      throw new TaskException("fail to build k8s ApiClient", e);
    }
  }

}
